A 20,000-seat arena with a retractable roof is planned.
一个可容纳2万名观众、带伸缩顶棚的竞技场正在规划中。
《柯林斯英汉双解大词典》
2
When the auto enters the highway system, a retractable arm will drop from the auto and make contact with a rail, which is similar to those powering subway trains electrically.